DECL is a multidisciplinary engineering organization offering a full range of integrated engineering design, construction, and project support services to the power, real estate, cement manufacturing, Hotels & resorts, and infrastructure projects. It is mainly focused on the civil, mechanical, electrical, and plumbing aspects of a project. From its very inception, DECL has been crafted with the same philosophy as its mother's concern. DECL will provide consulting engineering services for the engineering items. Doreen’s constant drive to contribute to the growth of the nation is clearly visible in DECL, as it plays a major role in fortifying Bangladesh, by building solid infrastructures that not only serve the present times but will also prove to be adequate for the generations to come.

After confirming with the client and other professionals, we will review the architectural concept design in detail and give advice on the engineering aspect if needed. A study is done on the possible MEP option to choose the most appropriate economical design. An outline schematic for each MEP system is prepared. We then establish a conceptual arrangement of the MEP system, coordinated with architectural and structural design. A location and space is selected for the MEP plant and equipment. After preparing a layout for each typical floor, we prepare a design and construction program.

After confirmation from the client on schematic design, we will carry out detailed engineering design and calculation. Tender drawing, specification, and schedule will be prepared.

Issue drawing and specification for construction incorporating all changes agreed with contractor during negotiation. Review contractor’s drawing and equipment / material submission.